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D( x )
x-5.7 = 0
x-5.7 = 0
x-5.7 = 0
x-5.7 = 0 // + 5.7
x = 5.7
x in (-oo:5.7) U (5.7:+oo)
9.1/(x-5.7) = 1.4 // - 1.4
9.1/(x-5.7)-1.4 = 0
9.1/(x-5.7)+(-1.4*(x-5.7))/(x-5.7) = 0
9.1-1.4*(x-5.7) = 0
17.08-1.4*x = 0
(17.08-1.4*x)/(x-5.7) = 0
(17.08-1.4*x)/(x-5.7) = 0 // * x-5.7
17.08-1.4*x = 0
17.08-1.4*x = 0 // - 17.08
-1.4*x = -17.08 // : -1.4
x = -17.08/(-1.4)
x = 12.2
x = 12.2
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